package com.example.text.telnet;

import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.DelimiterBasedFrameDecoder;
  import io.netty.handler.codec.Delimiters;
  import io.netty.handler.codec.string.StringDecoder;
  import io.netty.handler.codec.string.StringEncoder;
  import io.netty.handler.ssl.SslContext;
  
  /**
   * Creates a newly configured {@link ChannelPipeline} for a new channel.
   */
  public class TelnetServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private static final StringDecoder DECODER = new StringDecoder();
      private static final StringEncoder ENCODER = new StringEncoder();
  
      private static final TelnetServerHandler SERVER_HANDLER = new TelnetServerHandler();
  
      private final SslContext sslCtx;
  
      public TelnetServerInitializer(SslContext sslCtx) {
          this.sslCtx = sslCtx;
      }
  
      @Override
      public void initChannel(SocketChannel ch) throws Exception {
          ChannelPipeline pipeline = ch.pipeline();
  
          if (sslCtx != null) {
              pipeline.addLast(sslCtx.newHandler(ch.alloc()));
          }
  
          // Add the text line codec combination first,
          pipeline.addLast(new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter()));
          // the encoder and decoder are static as these are sharable
          pipeline.addLast(DECODER);
          pipeline.addLast(ENCODER);
  
          // and then business logic.
          pipeline.addLast(SERVER_HANDLER);
      }
  }


